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Practical answers to common plastic material challenges

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Q

ABS burnt (trapped air burn marks)

A

Repeated burning at a fixed position=venting problem; clean the vent grooves first.

Injection Molding ABS；burnt；trapped air；diesel effect；vent groove

Q

ABS jetting marks (snake marks)

A

For ABS jetting marks, 'let the material hit the wall first when entering': the gate design cooperates with the speed curve so that the front adheres to the wall and spreads as soon as it enters the cavity, and the snake marks disappear immediately, which preserves capacity better than simply red...

Injection Molding ABS；jetting marks；snake marks；gate；injection speed

Q

ABS weld line (bonding line)

A

For ABS weld lines, 'if it cannot be eliminated, transfer it + raise temperature + vent': treating it as a structural design problem and avoiding it to a non-load-bearing area in advance is more effective than hard adjusting on the machine afterwards.

Molds & Tooling ABS；weld line；bonding line；venting；gate position

Q

ABS injection sink mark

A

For ABS sink marks, 'first manage the structural wall thickness, then manage the holding compensation': rib thickness and thick walls are the root, holding and freeze-off are the technique; only piling holding pressure on the machine without touching the structure easily introduces internal stres...

Injection Molding ABS；sink mark；shrinkage；rib position；holding pressure；freeze-off

Q

ABS injection warpage deformation

A

The main cause of ABS warpage is 'stress and uneven cooling' rather than crystallization shrinkage: balancing mold temperature, restraining holding pressure, and sufficient cooling are the main lines; ABS is easier to adjust than PP/PE, but ignoring uneven cooling still causes warpage.

Injection Molding ABS；warpage；uneven cooling；differential shrinkage；holding pressure

Q

ABS injection flash (burrs)

A

For ABS flash, first reduce the process pressure, then check the mechanical clamping and mating: reversing the order easily crushes the venting and accelerates mold wear; flash in individual cavities requires checking the filling balance rather than adjusting the overall pressure.

Injection Molding ABS；flash；burr；clamping force；parting line

Q

ABS injection short shot (lack of material)

A

Check ABS short shots in the order of 'pressure and speed→temperature→venting→structure': first increase pressure and speed, then keep warm, then vent, and finally evaluate the wall thickness; the short shot method is a sharp tool for locating the last filling point.

Injection Molding ABS；short shot；lack of material；injection pressure；venting

Q

Flow marks (ripples) near the ABS gate

A

ABS flow marks are the externalization of the loss of control of the front's 'temperature and rhythm': the three axes of heating up, stabilizing speed, and large gate; high-gloss parts especially need fine front management; once ripples appear, they are difficult to cover up by post-processing.

Injection Molding ABS；flow marks；ripples；injection speed；front temperature

Q

Poor surface gloss of ABS products

A

ABS gloss='mold polishing + melt mold conformance': the mold determines the upper limit, temperature and pressure determine the replication; mold temperature has a great influence on gloss, the mold temperature for high-gloss parts must be given generously, and at the same time don't let degradat...

Extrusion & Post ABS；poor gloss；mold temperature；polishing；replication

Q

ABS brittle cracking——sharp corner and notch stress concentration

A

A sharp corner in the structure is the starting point of a crack.

Molds & Tooling ABS；stress concentration；sharp corner；rounded corner；structural design

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